Core for tire-casings



l. B. BINNS.

CORE FOR TIRE CASINGS. APPLICATION FILED MAR. 18, I92I.

UNITED STATES PATENT OFFICE.

JOHN B. BINNS, OF AKRON, OHIO, ASSIGNOR OF ONE-FIFTH TO STEPIIEN J.TAYLOR, ONE-FIFTH TO EARL WISSINGER, BOTH OF CUYAHOG A FALLS, OHIO,ONE-FIFTH TO FRANK NOLTE, OF AKRON, OHIO, AND ONE-FIFTH TO SUPERIORRUBBER MOLD & EQUIPMENT COMPANY, OF CUYAHOGA. FALLS, OHIO, A CORPORATIONOF OHIO.

CORE FOR TLRE-CASINGS.

Specification of Letters Patent.

' Application filed larch 18, 1921. Serial No. 453,215.

To all whom it may concern:

Be it known that I, JOHN B. Burns, a subject of the King of GreatBritain, residing at Akron, county of Summit, State of Ohio, haveinvented certain new and useful Improvements in Cores for Tire-Casings,of AVlllCll the following is a specification.

My invention relates to the manufacture of tire casings, and has for itsobject to provide an improved construction of tire core upon which thecasing is to be built, and afterward vulcanized, said core beingprovided with means for admitting a fluid, such as air, water or steam,between the exterior of the core and the interior of the casing, wherebya pressure will be exerted between the core and the casing-to take upthe stretch which takes place, bothin fabric and cord tires, while theyare being cured.

This object I accomplish in the manner and by the means hereinafterdescribed and claimed, reference being had to the accompanying drawing,in which Figure 1 is a side elevation of my improved core, the samebeing shown partly broken away.

Fig. 2 is a transverse section taken on the line II-II of Fig. 1.

Fig. 3 is a View similar to Fig. 2, illustrating a modifiedconstruction.

In the said drawing, reference being had more particularly to Figs. 1and 2, the reference numeral 1 denotes the body of the core, whichisshown made up in sections adapted to be collapsed in the usual manner.Some or all of these sections are formed hollow at 2 in the usual mannerto lighten the weight of the same, and one or more of Said sections isformed with an integral chamber 3 into which communicates a passage-way4, leading through the bead of the core, said passage-way beinginternally screw-threaded to receive a nipple 5, as clearly shown inFig. 2. Leading radially from the chamber or chambers 3 are a pluralityof ducts 6, said ducts communicating with a series of exterior grooves 7formed on the sections escape between the sections of the core, Iprovide a suitable packing 8, as shown.

In operation, the tire casing having been built or assembled upon thecore, and during the vulcanization operation fluid is admitted throughthe nipple or nipples 5 to the chamber or chambers 3, from whence itwill pass through the ducts 6 to the grooves 7, thus exerting thedesired pressure upon the inside of the tire casing, said pressure, dueto the annular arrangement of said grooves 7,

extending entirely around the core.

In Fig. 3 I have shown a modifiedform wherein the chamber or chambers 3are dispensed with, a duct 9 leading direct to the interior chamber 2 ofone or more of the sections of'the core, said core sections hav- 1ngformed therein a plurality of narrow slots 10 communicating with thechambers 2, whereby the 'fluid will be permitted to escape t0 theexterior of the core. By providing these narrow slots 10, it will beapparent that the same readily may be cleared, should they becomeclogged, by the insertion of a knife blade, or similar narrow object,said construction possessing obvious advantages over the minute ductsdisclosed in the construction shown in Figs. 1 and 2.

If desired, the circumferential grooves 7 may be provided on theexterior of the core sections, though these grooves are not essential. 7

While I have shown my invention applied to a sectional core, it will beunderstood that it is equally applicable to an integral core, such as isused in the manufacture of smaller. sized clencher tire casings.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is

1. A core for tire casings, formed with a series of circumferentialgrooves in its casing receiving surface, and means for admitting a fluidto said grooves.

2. A core for tire casings, formed with a series of circumferentialgrooves in its casing receiving surface, 'a chamber in said corecommunicating with said grooves, and means for supplying fluid to saidchamber.

3. A core for tire casings, formed with a series of circumferentialgrooves in its casing receiving surface, a chamber in said core, ductsleading from said chamber to Patented Dec. 13, 1921.

,said grooves, and means for supplying fluid to said chamber. 5

4. A core for tire casings, formed with a series of circumferentialgrooves in its casing receiving surface, a chamber in said core, ductsleading from said chamber to said grooves, and a passage-way through thebead of said'core communicating with said chamber, whereby fluid may besupplied thereto. I

5. A core for tire casings, comprising a' plurality of separate sect onseach closed at their ends to form chambers therein, said sections beingprovided with a series of cirlswumferential grooves registering witheach municating with said chamber whereby fluid 20 may be suppliedthereto. 7

6.. A hollow core for tire casings, com

prising means for supplying fluid to the interior thereof, and a seriesof narrow elongated slots in said core communicating with 25 theinterior thereof.

In testimony whereof, I hereunto aflix my signature.-

JOHN B. BINNS.

